Figure 3. Time of day, indicated by ZT (lights on ZT0), influenced baseline gastroc muscle and BAT thermogenesis .

A, baseline gastroc temperature and activity‐related gastroc heat dissipation was highest at ZT18, with the most ZT‐associated differences seen between baseline during the first 10 min of treadmill walking. B, BAT thermogenesis showed a similar pattern of baseline temperature, with treadmill walking activity inducing a significant suppression in temperature (^* P < 0.05). C, mixed β‐adrenergic antagonist nadolol significantly suppressed baseline and activity‐related gastroc heat dissipation during 10 min of treadmill walking (^* P < 0.05) (n = 8).